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Sphere Eversion: Ruled Surface

Sphere eversion with a ruled surface. In the intermediate stage, the surface is very similar to half-way model with a Boy's surface. Reference: Analytic sphere eversion using ruled surfaces https://arxiv.org/abs/1711.10466 More about the sphere eversion problem and the method called "Thurston's corrugations": Outside In:    • how to theoretically turn a sphere inside out   More about Boy's surface:    • Boy's Surface   Another method, with many variations including Boy's surface: The Optiverse:    • The Optiverse   And an interactive demo: https://rreusser.github.io/exploratio...